I think instead that this shit has always happened, the difference is tech, cheap devices and sharing that make us aware of this.
At the end this awareness makes us better and those beasts will be always hopeless beasts
To a degree you're right. However, I think a lot of the viciousness here is showmanship to scare others. There's always been viscous killing but if it's not taped it's usually done by serial killers who actually enjoy that sorta shit.
Personally, I don't seek this shit out to watch. But if it comes around I'm glad to watch it because it reminds me of why i keep a loaded shotgun in the house - that and the details of many home-invasions lately.